The fuel-efficient Dreamliner is making it feasible for airlines to try new long-haul flights. For Boeing, there’s a lot riding on the plane’s inaugural US route, Boston-to-Tokyo.

EVERETT, Wash. — At first glance, the 787 Dreamliner doesn’t appear all that revolutionary. Except for long, thin glider-like wings, high ceilings framed by blue LED lights, and large windows that dim at the touch of a button, it looks much like any other Boeing jet.

But the long-awaited twin-aisle plane, which launches its first commercial US route from Logan International Airport next month, promises to open new long-distance destinations from Boston and other midsize markets. After Japan Airlines starts flying the 787 nonstop between Boston and Tokyo on April 22, Logan officials anticipate that wide adoption of the fuel-efficient jet may someday open previously unfeasible routes to China, India, Greece, and Brazil.

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